Add define for backward compatibility + remove commented line

Author: mathieukaelin

src/MagAlpha.h

@@ -18,6 +18,10 @@
 #endif
 #include "MagAlphaGen3.h"
 
+//SPI Mode: MagAlpha Gen3 support SPI mode 3 and 0 [SPI_MODE3, SPI_MODE0]
+#define MA_SPI_MODE_0       SPI_MODE0
+#define MA_SPI_MODE_3       SPI_MODE3
+
 class MagAlpha: public MagAlphaGen3 {};
 
 #endif //MAGALPHA_H

src/MagAlphaGen3.h

@@ -20,7 +20,6 @@
 #else
      #include "WProgram.h"
 #endif
-// #include <SPI.h>
 #include "MagAlphaBase.h"
 
 class MagAlphaGen3: public MagAlphaSPI {